Fluid Level Tubes

DCS Code: 2B20.40 Last Updated: March 27, 2026
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Purpose

Connected tubes of different shapes (straight, zigzag, spiral, S-curve) all equilibrate to the same water level, showing that hydrostatic pressure depends only on vertical height, not path geometry.

Fluid level tube apparatus in a white frame: four connected glass tubes filled with blue-colored water -- one straight wide tube, one with zigzag bends, one spiral, and one S-curve -- all showing water at the same height
Figure 1: Blue-dyed water equilibrates to the same height in all four connected tubes regardless of their geometry.
Demo Apparatus